Server Domain is not equal to XMPP Domain

This is the situation:

XMPP Server: xmpp.myserver.de

XMPP Domain: example.de

DNS Record: _xmpp-server._tcp.example.de … SRV xmpp.myserver.de

If I configure openfire for xmpp.myserver.de (this is the server where openfire run), then all logins are under user@xmpp.myserver.de. But I want a login like user@example.de. Is that possible?